qml.execute no longer accepts mcm_config argument

[andrijapau]

Context:

Further qml.workflow clean-up.

Found usage in Catalyst: PennyLaneAI/catalyst#1452
No usage in Lightning.

Description of the Change:

Introduce kwargs postselect_mode and mcm_method to qml.execute signature. Raise deprecation warning to user if they try to use mcm_config kwarg.

Side-effect: Had to xfail any tests that had to do with Catalyst since they assume certain keys from the QNode.execute_kwargs.

Benefits:

Keyword parity with qml.QNode.

Possible Drawbacks: None identified.

[sc-80541]

[albi3ro]

We should also add an entry to deprecations.rst.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.56%. Comparing base (b42e89e) to head (b02f0f0).
Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6807      +/-   ##
==========================================
- Coverage   99.60%   99.56%   -0.05%     
==========================================
  Files         476      476              
  Lines       45237    45241       +4     
==========================================
- Hits        45060    45043      -17     
- Misses        177      198      +21     

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[JerryChen97]

LGTM!